21231210202222 has 4 divisors (see below), whose sum is σ = 31846815303336. Its totient is φ = 10615605101110.

The previous prime is 21231210202159. The next prime is 21231210202247. The reversal of 21231210202222 is 22220201213212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21231210202193 and 21231210202202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307802550554 + ... + 5307802550557.

It is an arithmetic number, because the mean of its divisors is an integer number (7961703825834).

Almost surely, 2^{21231210202222} is an apocalyptic number.

21231210202222 is a deficient number, since it is larger than the sum of its proper divisors (10615605101114).

21231210202222 is a wasteful number, since it uses less digits than its factorization.

21231210202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615605101113.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21231210202222 its reverse (22220201213212), we get a palindrome (43451411415434).

The spelling of 21231210202222 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred ten million, two hundred two thousand, two hundred twenty-two".